A mother has been convicted of manslaughter for stabbing her daughter to death at a Hong Kong public rental flat four years ago under the delusion that she had to kill the victim to protect her son. Part-time security guard Yang Leying, 50, pleaded guilty at the High Court on Tuesday after prosecutors agreed to reduce her original murder charge on the basis that she was suffering from an abnormality of mind when she fatally assaulted her 24-year-old daughter Chen Lianqin on December 6,...